The closest approach to the original sound - these words have formed the cornerstone of Quad's philosophy for many decades. More than just a slogan, it underlies the company's commitment to producing the finest audio equipment, capable of reproducing all the elements and emotion of a live musical performance. Quad has been responsible for many landmark hi-fi products throughout its history, none more famous than successive generations of the ESL - the world's most revered electrostatic panel loudspeaker, a technology invented by Quad's founder, Peter Walker. To create the ERA-1 - the company's first-ever headphones - Quad developed a planar magnetic driver delivering a fast, open and transparent performance. The resulting sonic realism and fidelity to the source is fully in keeping with the brand's heritage, displaying qualities akin to the famous ESLs.